23520431 has 4 divisors (see below), whose sum is σ = 25658664. Its totient is φ = 21382200.

The previous prime is 23520403. The next prime is 23520443. The reversal of 23520431 is 13402532.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23520431 is a prime.

It is a super-2 number, since 2×23520431² = 1106421348851522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23520491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069100 + ... + 1069121.

It is an arithmetic number, because the mean of its divisors is an integer number (6414666).

Almost surely, 2^23520431 is an apocalyptic number.

23520431 is a deficient number, since it is larger than the sum of its proper divisors (2138233).

23520431 is a wasteful number, since it uses less digits than its factorization.

23520431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138232.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23520431 is about 4849.7866963404. The cubic root of 23520431 is about 286.5157003620.

Adding to 23520431 its reverse (13402532), we get a palindrome (36922963).

The spelling of 23520431 in words is "twenty-three million, five hundred twenty thousand, four hundred thirty-one".